WO1995030247A1 - Procede de traitement thermique de fil supraconducteur - Google Patents
Procede de traitement thermique de fil supraconducteur Download PDFInfo
- Publication number
- WO1995030247A1 WO1995030247A1 PCT/US1995/005186 US9505186W WO9530247A1 WO 1995030247 A1 WO1995030247 A1 WO 1995030247A1 US 9505186 W US9505186 W US 9505186W WO 9530247 A1 WO9530247 A1 WO 9530247A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wire
- reel
- oxide superconductor
- porosity
- isolating
- Prior art date
Links
- 239000002887 superconductor Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims description 42
- 230000008569 process Effects 0.000 title description 9
- 230000001939 inductive effect Effects 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 16
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 9
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 9
- 239000002243 precursor Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 37
- 239000000203 mixture Substances 0.000 claims description 13
- 239000002904 solvent Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000003870 refractory metal Substances 0.000 claims description 6
- 229920002678 cellulose Polymers 0.000 claims description 4
- 239000001913 cellulose Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 229920002522 Wood fibre Polymers 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 229910052715 tantalum Inorganic materials 0.000 claims description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 239000002025 wood fiber Substances 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 20
- 239000011248 coating agent Substances 0.000 abstract description 19
- 238000009792 diffusion process Methods 0.000 abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000011068 loading method Methods 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- 239000000395 magnesium oxide Substances 0.000 description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 239000012442 inert solvent Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 238000005253 cladding Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000003618 dip coating Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 206010067482 No adverse event Diseases 0.000 description 1
- FQNGWRSKYZLJDK-UHFFFAOYSA-N [Ca].[Ba] Chemical compound [Ca].[Ba] FQNGWRSKYZLJDK-UHFFFAOYSA-N 0.000 description 1
- JUTBAAKKCNZFKO-UHFFFAOYSA-N [Ca].[Sr].[Bi] Chemical compound [Ca].[Sr].[Bi] JUTBAAKKCNZFKO-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000011369 resultant mixture Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/01—Manufacture or treatment
- H10N60/0268—Manufacture or treatment of devices comprising copper oxide
- H10N60/0801—Manufacture or treatment of filaments or composite wires
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49014—Superconductor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4981—Utilizing transitory attached element or associated separate material
- Y10T29/49812—Temporary protective coating, impregnation, or cast layer
Definitions
- the invention relates generally to a system and process for manufacturing high transition temperature (T c ) oxide superconductor wire.
- the invention more particularly relates to a system and apparatus for coating, winding and heat treating high T c oxide superconductor wire.
- the prior art wire deforming step is typically carried out by feeding the wire from a conventional spool through the deforming step and taking up the deformed wire onto a second conventional spool.
- Long lengths of wire can be efficiently wound onto the spool.
- the conventional spool is not readily adaptable for use in furnaces and results in inefficient use of furnace space.
- the wire tends to sag and become distorted (wavy) because of the coiled form of the wire on the spool.
- the multiple overlapping windings on the spool do not permit efficient oxidation and phase transformation of the oxide superconductor.
- a further disadvantage to winding the oxide superconductor wire prior to heat treatment is that overlapping contact between portions of the wire results in diffusion bonding of the wire to itself and the mandrel, thereby degrading superconducting properties and preventing the unspooling of the heat treated wire.
- Silver is commonly used as a protective cladding for the oxide superconductor, in particular because the cladding itself is electrically conductive and does not prevent oxygen diffusion to the oxide superconductor.
- Even the silver cladding will diffusion bond to other portions of the silver-cladded wire which are in contact during heat treatment.
- US Patent No. 5,140,006 discloses a method and apparatus for coating a silver-cladded oxide superconductor wire with a diffusion- inhibiting material and taking up the coated wire onto a spool.
- Rare earth oxides are specifically disclosed as a desirable diffusion inhibiting material and no disclosure of the desirability of removing the material after treatment is disclosed. It is the object of the present invention to efficiently process high-T c superconducting oxide wire by increasing the simplicity and efficiency of the method used to load and unload wire during processing, by reducing adhesion of the wire to itself and by maximizing the use of furnace space during heat treatment.
- an oxide superconducting wire is prepared by providing an oxide superconductor wire and applying an isolating layer to an external surface of the wire.
- the isolating layer includes an isolating material and a porosity-inducing component.
- the coated wire is heated so as to induce porosity into the isolating layer, thereby obtaining a removable porous isolating layer.
- the coated oxide superconductor wire is then further processed, as required.
- an oxide superconducting wire is prepared by providing an oxide superconductor wire and applying an isolating layer to an external surface of the wire.
- the isolating layer includes an isolating material and a porosity-inducing component.
- the coated wire is wound onto a reel in a spiralling manner, such that each turn of the spiral is in alignment with the preceding turn of the spiral along an axis perpendicular to the axis of winding.
- the coated oxide superconductor wire is then further processed, as required.
- oxide superconducting wire as that term is used herein, it is meant a wire at all stages of manufacture, but which can ultimately be processed into a superconductor wire. Therefore, precursor wires, which are converted into an oxide superconductor wire is deemed a superconductor wire for the purposes of the invention. Likewise, a wire which is only partially converted into the oxide superconductor, or which contains the oxide superconductor but requires further processing to optimize the electrical properties are likewise deemed an oxide superconductor wire for the purposes of the invention.
- in alignment as that term is used herein, it is meant that each turn of the spiral is in alignment with and substantially completely overlapping with the previous turn of the spiral, such that the wound wire takes on a substantially two-dimensional appearance.
- the wound wire is similar in appearance to a wound cassette reel of audio tape.
- porosity-inducing component a primarily carbon-containing material which is capable of combustion or thermal decomposition with very little or no residues. The space formerly occupied by the component, after such decomposition, provides the requisite porosity.
- the oxide superconducting wire prepared by the present invention possesses superior isolation of successive wire layers and the spool and is capable of easy removal of the layer for further wire processing.
- Figure 1 is (a) a front view nd (b) a side view of an apparatus used in coating and winding the precursor wire according to the invention;
- Figure 2 is a side view of an apparatus used in coating and winding the precursor wire according to uV invention
- Figure 3 is (a) an edge on view and (b) a side view of a reel used in winding the wire according to the invention.
- the applicants have discovered that coating a superconductor wire with the isolating layer of the present invention results in superior isolation of successive wire layers and in easy removal of the layer for further wire processing.
- the ease of coating, superiority of its isolating properties and ease of removal provides several processing advantages.
- the oxide superconductor wire when wound onto a reel-like support according to the method of the invention, can be processed more efficiently in a furn ce environment, without detrimental affect to processing conditions or final superconducting properties.
- the present invention permits an oxide superconductor wire to be rapidly and efficiently loaded and unloaded onto a cassette reel for furnace processing during oxide superconductor phase-forming steps. The wire then may be transferred to conventional spools for wire-forming steps, if desired.
- cassette reels are easily interfaceable with other processing equipment, in particular automated processing equipment, which improves the efficiency of the manufacturing process, if desired.
- the applicants have found that use of a porous isolating layer effectively prevents bonding of the wire turns to each other, while being capable of easy removal.
- the porosity of the layer increases the ease with which the coating can be removed for the wire by reducing surface area contact with the wire and increasing coating brittleness.
- the isolating material may be any material which prevents sticking of overlapping layers of superconductor wire and which does not poison the superconducting wire and degrade superconducting properties.
- refractory metal oxides may be used in the practice of the invention.
- the applicants have found oxides of aluminum, calcium, tantalum, magnesium, zirconium and tungsten to be particularly effective. Selection of a particular refractory metal oxide is based on the ease of its removal and effectiveness in isolation of the wire turns.
- Magnesium oxide (MgO) is a particularly preferred metal oxide. It is preferred to use refractory metal oxides having a relatively large particle size and, in particular, a particle size in the range of 1 to 50 microns. Refractory metal oxide particles of small grain size promote adherence to the wire and make it difficult to remove. The adherence is of a mechanical, rather than a chemical, nature.
- the porosity of the layer improves the ease of its removal subsequent to the heat treatment.
- the ability to remove the isolating layer after heat treatment is important because the layer may impede further processing of the wire.
- the porosity may be obtained by including a porosity-inducing component in the isolating layer which is capable of thermal decomposition or combustion with little or no residue.
- the porosity-inducing component decomposes or combusts, leaving voids in the isolating layer and thereby introducing porosity into the layer.
- Suitable porosity-inducing components include but are in no way limited to, cellulose, wood fiber, saw dust, graphite, paraffin, polypropylene and polyethylene.
- the isolating layer including an isolating material and a porosity- inducing component, may be applied using an inert solvent as the carrier liquid.
- inert solvent it is meant herein that the isolating material and the porosity-inducing component are stable in the solvent with no adverse reactions between the solvent and the added materials. It is further required that the porosity-inducing material be insoluble in the carrier liquid, since a soluble material does not occupy a significant volume in the resulting layer.
- the isolating material and the porosity-inducing component are added to an inert solvent.
- the resultant mixture can be a solution (of the isolating material only), dispersion, slurry or a suspension; however, due to the low solubility of the isolating material and the porosity-inducing component, the mixture is most typically a suspension or slurry.
- the solvent is preferably volatile, so that evaporation of the solvent and subsequent adherence of the layer to the wire occurs rapidly.
- the solvent is preferably a low molecular weight liquid, such as ethanol, acetone, hexane or water.
- the weight percent of added solids (isolating material + porosity- inducing component) in the mixture may be in the range of 5 to 25 wt%.
- An exemplary mixture is prepared by adding approximately 100 g powder into 1 liter of ethanol (approx. 10 wt %). The solids range from 5 wt% to 99 wt% isolating material, the balance porosity-inducing component. The greater the level of isolating material in the solids, the more effective the anti-bonding effect of the layer; however, this improvement is obtained at the cost of the removability of the layer.
- a preferred process uses 50 g MgO, 50 g cellulose in 1 liter of ethanol; however, ratios of 10% MgO/90% cellulose have been successfully used to provide a highly releasable layer.
- the mixture may be applied to the wire in any conventional manner, including but not limited to, spray coating and dip coating and the like.
- Spray coating includes generating droplets of the carrier liquid containing the isolating material and porosity-inducing component therein and impinging the droplets on the surface.
- Dip coating includes passing the wire through a bath which contains a mixture of the isolating material and porosity-inducing component therein.
- the isolating material and the porosity-inducing component may be introduced in two separate application steps (i.e., spray coating of first one, and then the other, component onto the layer). In such instances, the porosity-inducing component should be applied closest to the wire in order to ensure easy release.
- an apparatus 30 includes a base 31 which supports a receiving reel 32 using mounting means 33 which is capable of rotation.
- the receiving reel 32 is driven by a motor 34, which causes the reel to rotate.
- a wire 35 is first provided on a feeding reel 36 which may be rotatingly mounted on the base 31 by mounting means 37. Upon rotation of the feeding reel 36, wire 35 is unwound. Alignment of the receiving and feeding wheels 32 and 36, respectively, is preset to prevent twisting and distortion of the wire.
- the wire is loaded onto the receiving reel 32 as a spiral with each turn of the spiral aligned with the previous turn, so that the turns are aligned and substantially completely overlapping along an axis perpendicular to the axis of rotation.
- a control panel 39 controls the speed of the driving motor 34.
- an isolating layer is applied to the wire before it is taken up onto the reel 32.
- the isolating layer prevents overlapping layers from sticking to each other after heat treatment.
- the apparatus 30 includes a receptacle 38 for holding a mixture which comprises an isolating material and a pore-inducing component in an inert solvent.
- the receptacle 38 may contain a guide pulley (not shown) for directing the wire down into the mixture contained in the receptacle and back out of the receptacle towards the reel 32.
- the guide pulley additionally serves as a means of stirring the mixture during a coating operation.
- Some means of agitation is required to maintain dispersion of the suspended insoluble particles.
- Alternative means of agitation include use of a circulating pump, mechanical stirring or convection means.
- one end of the wire 35 is attached to the receiving reel 32 and the motor 34 is activated.
- the wire 35 is unwound from feeding reel 36 and drawn around the pulley and into the receptacle 38.
- the wire contacts the mixture contained in the receptacle, thereby depositing a layer of isolating material on the wire.
- the solvent dries to leave an isolating layer on the wire. Drying means (not shown) can be used to increase drying rate, if desired. Drying means include fans or heater or the like suitably between the receptacle 38 and reel 32.
- coating and loading the wire onto reel 32 may be accomplished from a cassette reel, which is useful when the method is to be integrated with automated processing.
- coating and loading the wire may be accomplished from spool to reel.
- the method and apparatus are modified, as shown in Fig. 2, where like elements are similarly numbered.
- a spool 40 is positioned adjacent to the feeding reel 36.
- the wire 35 is fed from the spool 40 and drawn over feeding reel 36.
- the wire is then processed as described above for a reel to reel transfer.
- the spool 40 should be positioned ⁇ n distance from reel 36 so that the wire 35 is not significantly bent or distorted as it is fed out from the spool.
- the isolating layer by feeding out the oxide superconducting wire from a conventional spool, through a receptacle containing a mixture of the isolating material and porosity-inducing component and onto a second conventional spool.
- the manner of the process is readily understood with reference to Figs. 1 and 2, above.
- the coating when not removed, it can function as a desirable insulating layer.
- the wire may take on any geometry, including but not limited to, wires having a circular, avoid, ellipsoidal, rectangular, square and polygonal cross-section.
- the wire may have a width to thickness ratio in the range of 1 to 1000.
- the reel which is used in the above method may be made from a material capable of withstanding high furnace temperatures, such as nickel alloys and stainless steel.
- the reel includes a central mandrel 42 and two opposing end plates 44 and 46, respectively.
- the mandrel 42 may be of substantially the same width as the wire.
- the end plates preferably contain apertures 48 to allow the passage of oxygen and/or other processing gases.
- the reel is made from components capable of assembly and disassembly. In this case, the end plates 44 and 46 are removed from the mandrel 48.
- the mandrel is a compressible three-piece mandrel which permits it to be removed from the spiral core.
- the pancake-like wire spiral can be placed on a flat ceramic sheet and heat treated without the reel.
- a retaining ring around the outer circumference of the spiral wire in order to retain its shape during heat treatment.
- the reel can be made of any material without regard to high temperature stability. Aluminum is acceptable.
- the wire is ready for heat treatment.
- heat treatment includes forming the oxide superconductor phase or optimizing the superconducting properties of the wire.
- the heat treatment may be carried on the reel, or one or more plates of the reel may be removed prior to heat treatment.
- the isolating layer prevents bonding of the neighboring layers.
- the isolating layer of the invention permits complete overlap of the wire turns without sticking, which is not possible in the prior art.
- the isolating layer may be easily removed by passing it under a stream of water, or against an abrasive surface. Ultrasonification will also remove the layer. Other conventional means of removing coatings are within the scope of the present invention.
- the method of the present invention can be used to process any oxide superconductor wire.
- the oxide superconductor may include rare earth barium cuprates, bismuth strontium calcium cuprates and thallium barium calcium cuprates.
- the oxide superconductor wires are typically processed with silver or other malleable, inert metal to impart desirable mechanical properties to the wire, which is otherwise too brittle to function as a wire.
- the wire used in the invention may be a precursor to an oxide superconductor, such as the metallic alloys disclosed in US 4,826,808 to Yurek et al. , herein incorporated by reference, which is then oxidized to form the desired oxide superconductor.
- the wire may include an oxide superconductor which is subjected to further heat treatment to optimize the formation and properties of the oxide superconductor.
- the wire preferably contains a malleable, but inert, metal for improved formability and mechanical flexibility.
- the preferred metal is silver.
- Oxide superconductor wires suitable for use in the method of the present invention are described in "Critical Issues OPIT Processing of High-T c BSCCO Superconductors" by Sandhage et al. (JOM 43(3), 21-25 (1991)), herein incorporated by reference.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Selon l'invention, pour obtenir un fil d'oxyde supraconducteur, on prend une longueur de fil précurseur que l'on traite pour le transformer en fil d'oxyde supraconducteur et le revêtir d'une couche isolante. Le fil pourvu de sa couche isolante est enroulé en spirale sur une bobine, de sorte que chaque spire soit alignée avec la spire précédente le long d'un axe perpendiculaire à l'axe d'enroulement. On chauffe alors le fil enroulé pour former le fil d'oxyde supraconducteur. On obtient la couche isolante, qui peut être enlevée, en appliquant sur le fil une solution contenant un oxyde métallique et un composant induisant une porosité, et en chauffant le fil pourvu de son revêtement pour induire une porosité et maîtriser la taille des particules d'oxyde métallique de façon que le revêtement puisse être enlevé. Ce revêtement doit servir à isoler les spires se chevauchant du fil enroulé de fils voisins, de sorte qu'il n'y ait pas de collage par diffusion ou d'adhérence entre les spires. Le revêtement doit également pouvoir être enlevé facilement car il peut interférer lors d'un traitement ultérieur du fil supraconducteur d'oxyde.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/235,560 US5952270A (en) | 1994-04-29 | 1994-04-29 | Process for heat treating superconductor wire |
US08/235,560 | 1994-04-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995030247A1 true WO1995030247A1 (fr) | 1995-11-09 |
Family
ID=22885999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/005186 WO1995030247A1 (fr) | 1994-04-29 | 1995-04-27 | Procede de traitement thermique de fil supraconducteur |
Country Status (3)
Country | Link |
---|---|
US (4) | US5952270A (fr) |
CN (1) | CN1115108A (fr) |
WO (1) | WO1995030247A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19620825C1 (de) * | 1996-05-23 | 1997-10-09 | Siemens Ag | Verfahren zur Herstellung eines supraleitenden Hoch-T¶c¶-Verbundleiters |
DE19645995A1 (de) * | 1996-11-07 | 1998-05-14 | Siemens Ag | Verfahren zur Herstellung eines vorzugsweise bandförmigen Hoch-T¶c¶-Verbundsupraleiters |
EP1052707A2 (fr) * | 1999-05-10 | 2000-11-15 | Sumitomo Electric Industries, Ltd. | Procédé de fabrication d'un fil supraconducteur et support pour traitement thermique |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6339047B1 (en) * | 2000-01-20 | 2002-01-15 | American Semiconductor Corp. | Composites having high wettability |
NZ514068A (en) * | 2001-09-10 | 2001-09-28 | Ind Res Ltd | Parting agents for metal-clad high-temperature superconducting wires and tapes |
US7250704B1 (en) * | 2003-08-06 | 2007-07-31 | Synchrony, Inc. | High temperature electrical coil |
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Also Published As
Publication number | Publication date |
---|---|
US20020183208A1 (en) | 2002-12-05 |
US5952270A (en) | 1999-09-14 |
US6584334B2 (en) | 2003-06-24 |
CN1115108A (zh) | 1996-01-17 |
US20020176943A1 (en) | 2002-11-28 |
US6400970B1 (en) | 2002-06-04 |
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